Update ruby-version for ruby/setup-ruby action

Author: CGA1123

.github/workflows/codecov.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ${{ matrix.ruby }}
+          ruby-version: 3.3
           bundler-cache: true
       - uses: codecov/codecov-action@v4
         with: